The test method describes the procedure for determination of the total acid number of new and degraded polyol ester and diester based gas turbine lubricants by potentiometric titration technique. The method was validated to cover an acidity range 0.05 to 6.0 mg KOH g^-1. The method may also be suitable for the determination of acidities outside of this range and for other classes of lubricant.

Purpose:

The total acid number can be used to assist in the assessment of a lubricant during condition monitoring and for quality assurance/specification verification.

WARNING: This document may involve hazardous materials, operations, and equipment. This document does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this document to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.